Compilare: user.cpp: In function ‘int main()’: user.cpp:72:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.size() == n - 1) ^ user.cpp:75:41: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘std::vector<L>::size_type {aka unsigned int}’ [-Wformat=] printf("%ld\n%ld\n", sumcrt, sol.size()); ^ user.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); i++) ^ user.cpp:50:10: warning: unused variable ‘j’ [-Wunused-variable] long i, j; ^